JPH10332114A - Thick/thin combustion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the generation of NOx as small as possible in a thick/thin combustion apparatus as a whole without complicating the constitution of the apparatus. SOLUTION: This apparatus is so constituted that thin and long burner port faces 6 are provided on one edge side, that a plurality of burners 3 for thick combustion, each having burner port parts 7 for thick combustion for burning a thick fuel-air mixture of a fuel gas with combustion air, which is ejected to the burner port faces 6, are provided in parallel at intervals in the width direction of the burner port faces 6, and that thin and long burner port parts 14 for thin combustion for burning an ejected thin fuel-air mixture of a fuel gas with combustion air are provided between the burner port faces 6 having the burners 3 for thick combustion. In this case, each burner 3 for thick combustion is constituted with a first burner 3a for thick combustion, which has the multiple burner port parts 7 for thick combustion on the burner port face 6, and a second burner 3b for thick combustion, which has a smaller number of the burner port parts 7 for thick combustion than those of the first burner 3a for thick combustion on the burner port face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rich flame opening portion provided with an elongated flame opening surface at one end, and a rich mixture of fuel gas and combustion air is ejected onto the flame opening surface and burned. A plurality of rich burners are provided side by side at intervals in the width direction of the burner face, and light mixing of fuel gas and combustion air is performed between the burner faces of the rich burner. The present invention relates to a gray-scale combustion device provided with an elongated light flame port for blowing out and burning air.

[0002]

2. Description of the Related Art The above-described light-and-dark combustion apparatus burns a light flame generated in a light flame port by a rich flame generated in a light flame port of a burning burner while maintaining the flame. In the Japanese Patent Application Laid-Open No. H11-27139, all of a plurality of burner burners arranged side by side are provided with a large number of burner ports in the longitudinal direction of the burner face, and the number of burner burners is the same. For example, JP-A-8-20
0627).

[0003]

In the conventional rich-burn combustion apparatus, including the one disclosed in the above-mentioned publication, all of the thick burners are provided with a large number of rich flame ports. Although good, the ratio of the rich mixture to the lean mixture becomes large, and there is a problem that the generation value of NOx, which is a nitrogen oxide, becomes high in the whole apparatus. In this case, if it is only necessary to suppress the generation of NOx, it is conceivable to reduce the number of rich flame openings provided in the rich burner. The flame effect may worsen and cause incomplete combustion.

The present invention has been made in view of such a problem, and an object of the present invention is to reduce the ratio of a rich mixture to a lean mixture while maintaining a lean flame with a rich flame. , NOx generation as much as possible.

[0005]

According to the first aspect of the present invention, a plurality of darkening burners arranged side by side in the width direction of the flame surface are arranged in the longitudinal direction of the flame surface. A first thickening burner having a large number of rich flame openings, and a second thickening burner having a smaller number of rich flame openings than the first thickening burner in the longitudinal direction of the flame surface. And a burner. In other words, a plurality of thickening burners arranged in parallel are combined with a first thickening burner having a large number of rich flame openings and having a good flame holding effect, and a second thickening burner contributing to the reduction of the rich mixture. And the second thickening burner is appropriately selected and juxtaposed to provide a space between the flame outlet surfaces of the thickening burner. It is possible to reduce the ratio of the rich mixture to the lean mixture without impairing the flame holding effect on the light flame generated in the above, and it is possible to minimize the generation of NOx in the entire apparatus.

According to the second aspect of the present invention, the first thickening burners are arranged at both ends in the juxtaposition direction of the thickening burners, and the first thickening burners are arranged at both ends thereof. The second dark burner is disposed between the dark burners. In other words, by disposing the first enrichment burners at both ends in the direction in which the enrichment burners are juxtaposed, it is possible to prevent the light air-fuel mixture from flowing out of both ends of the first enrichment burners. The mixture can be burned.

According to the third aspect of the present invention, the first rich burner and the second rich burner have the rich flame port near both ends in the longitudinal direction of the flame surface. Have. That is,
By providing the rich flame port near both ends in the longitudinal direction of the flame surface of the first rich burner and the second rich burner, it is possible to prevent the light mixture from flowing out of both ends. And a light mixture can be sufficiently burned. As described in claim 2, the first darkening burners are disposed at both ends in the direction in which the darkening burners are juxtaposed, and the first darkening burners are disposed at both ends thereof. When the second thickening burner is disposed between the thickening burners, the length of the flame opening face is also increased in the direction in which the thickening burners are juxtaposed in cooperation with the above operation. Also in the direction, the outflow of the lean mixture from both ends to the outside can be prevented, and the lean mixture can be more effectively burned. Further, in the case of a gray-scale combustion apparatus in which an air curtain portion for preventing dew condensation or the like of the gray-scale combustion apparatus is provided outside both ends in the direction in which the thick burners are juxtaposed and in the longitudinal direction of the flame opening face, In addition, it is possible to prevent a problem such as incomplete combustion from occurring while preventing the light air-fuel mixture from flowing out to the air curtain portion and preventing dew condensation or the like of the concentration combustion device.

According to the fourth aspect of the present invention, the rich burner portions of the first rich burner are provided at substantially equal intervals on the burner surface, and Rich flame mouth and second darkness bar
Each of the deep flame outlets is formed of a plurality of slit-shaped flame holes. In other words, a plurality of slit-shaped flame holes are formed as one block on the flame port surface of the first dark burner, and a plurality of these blocks are provided at substantially equal intervals. Since rich flame is generated in the slit-shaped flame holes, the contact area with the lean air-fuel mixture increases, so that the lean air-fuel mixture can be sufficiently burned. Further, by forming the rich flame opening of the first rich burner and the second rich burner with a plurality of slit-shaped flame holes, a light flame opening adjacent to the rich burner is provided. The air-fuel mixture ejected from the fuel tank can be sufficiently burned.

According to the fifth aspect of the present invention, each of the first rich burner and the second rich burner has a deep flame outlet located near both longitudinal ends of the flame surface. Of the slit-shaped flame holes constituting the dense flame port portion, the flame hole located at the end is constituted by a V-shaped flame hole which projects the flame hole in a direction away from the flame surface. That is, as described in the third aspect of the present invention, the rich flame outlets of the first rich burner and the second rich burner are
It is provided near both ends in the longitudinal direction of the flame face, but by providing a V-shaped flame hole protruding outside the flame hole located at the extreme end, the rich flame can be further extended to the outside of the flame face. And the lean mixture can be burned more effectively.

According to the present invention, one or more second thickening burners are provided between the first thickening burners adjacent to each other in the direction in which the thickening burners are juxtaposed. Is arranged. In other words, two first rich burners adjacent to each other in the direction in which the rich burners are arranged are taken as one block, and this block forms one dense burn zone. Qi is surely burned. Therefore, by forming a plurality of such blocks,
A high-density combustion at high load becomes possible, and a first enrichment burner is provided at both ends in the direction in which the enrichment burners are arranged. As described in 3, when the rich burner ports are provided near both ends in the longitudinal direction of the burner face of the first rich burner and the second rich burner, all the lean air-fuel mixture is surely removed. Combustion enables high load combustion while reducing the generation of NOx as a whole of the apparatus.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. First, as shown in FIG. 1 and FIG. 2, the gray-scale combustion apparatus includes a burner case 1 and a box-shaped frame 2 inside the burner case 1 and a plurality of flat sheet metal. Dark burners 3 are housed side by side at a predetermined interval in the box-shaped frame 2. Below the burner case 1,
A fan 4 for supplying combustion air is provided, and its discharge port communicates with an air chamber 5 formed between the bottom of the burner case 1 and the bottom of the box-shaped frame 2.

The enrichment burner 3 is formed by bending a series of plate members and injects and burns a rich air-fuel mixture having a small air mixing ratio. Burner 3b. As shown in FIG. 3, in the first rich burner 3a, a rich flame port 7 for blowing a rich air-fuel mixture into an elongated flame opening surface 6 on the upper surface thereof and a non-flame port which does not blow a rich air-fuel mixture. The portions 8 are alternately arranged at substantially equal intervals along the longitudinal direction of the flame port surface. And this deep flame mouth part 7
Is composed of three slit-shaped flame holes 7a. The first rich burner 3a has a rich mixing chamber 9 communicating with each rich flame opening 7, and a rich inlet 10 for introducing fuel gas and combustion air into the rich mixing chamber 9. Is provided.

The second rich burner 3b is provided with a rich flame opening 7 for ejecting a rich air-fuel mixture only on both ends in the longitudinal direction of the flame surface, on the upper surface 6 of the burning surface. , This deep flame mouth part 7
Is composed of three slit-shaped flame holes 7a. Like the first rich burner 3a, the rich mixing chamber 9 communicates with each rich flame port 7, and the rich gas mixing chamber 9 is supplied with fuel gas and combustion air. An inlet 10 is provided.

The first thick burner 3a and the second thick burner 3b having such a configuration are spaced apart from each other in the width direction of the flame opening face 6,
They are alternately arranged as shown in FIG. A light mixing chamber 15 having an elongated light flame port 14 for ejecting a light air-fuel mixture having a high air mixing ratio is formed between the adjacent burners 3a and 3b. A light gas passage 11 for supplying a mixture of fuel gas and combustion air to the light mixing chamber 15, and a light inlet for introducing fuel gas and combustion air into the light gas passage 11. 12 are provided, and a large number of ejection holes 13 are formed in the light gas passage 11.
And a perforated plate 1 for air conditioning forming the bottom wall of the box-shaped frame 2
It is configured so that combustion air can be supplied upward from the air chamber 5 through the air chamber 6.

The thickening inlet 10 and the leaning inlet 12 provided in the both burners 3a and 3b are all arranged in the same direction, and the fuel gas for leaning and the leaning gas are arranged on the entire surface. A gas header 17 for distributing and supplying a fuel gas for use, and a concentration gas nozzle 18 attached to the gas header 17,
A light gas nozzle 19 faces each of the light inlets 10, and faces each of the light inlets 12.
A part of the combustion air in the air chamber 5 is sucked at a predetermined ratio by an ejector action by blowing the fuel gas from 9 and is introduced into each of the inlets 10 and 12. Further, the concentration gas nozzle 1 attached to the gas header 17
8. A gas supply path (not shown) for supplying the fuel gas to the lean gas nozzle 19 is provided with an opening / closing valve and an adjusting valve for adjusting the amount of supplied gas, respectively, so that the entire apparatus is adjusted to a desired heating amount. can do.

A cover plate 21 made of sheet metal having substantially the same shape as the side surfaces of the both-side burners 3a and 3b is provided on one side surface of the both-side burners 3a and 3b. Are provided at both ends in the longitudinal direction of the burners 3a and 3b.
The bent portions 22 formed at both ends of the cover plate 21 in the mounted state by being caulked to the corners 3a and 3b.
Abuts against the side surfaces of the dual-purpose burners 3a and 3b, and the light mixture in the light-mixing chamber 15 flows out to the longitudinal end sides of the dual-purpose burners 3a and 3b. It is configured to prevent Each cover plate 21 includes four sheet metal rectifying plates 23.
, And the upper end of each straightening plate 23 is configured to be substantially the same height as the flame outlet face 6.

More specifically, the combustion process will be described. The fuel gas supplied through the gas supply passage is supplied to the enrichment gas nozzle 18,
A part of the combustion air in the air chamber 5 is sucked at a predetermined ratio through the light gas nozzle 19 by an ejector action, and is introduced into the concentration inlet 10 and the light inlet 12, respectively. The fuel gas supplied from the concentration inlet 10 and the air chamber 5
The supplied combustion air is mixed in the rich mixing chamber 9, and a rich air-fuel mixture having a small air mixing ratio is blown out from the rich flame port 7 of the flame port surface 6 shown in FIG. 3. On the other hand, the fuel gas supplied from the lean inlet 12 and the combustion air supplied from the air chamber 5 pass through the lean gas passage 11 through the lean gas passage 11. The mixture is blown out from the blowout hole 13, mixed in the light mixing chamber 15, and blows out the light mixture having a high air mixing ratio from the light flame port 14. As described above, the rich air-fuel mixture spouted from the rich flame opening 7 is burned, and the lean air-fuel mixture is burned by the rich flame generated in the rich flame opening 7.

At this time, as shown in FIG. 4, the first flame burner and the second flame burner are alternately arranged side by side, so that the flame holding effect against the lean mixture by the rich flame can be obtained. Without loss, the ratio of the rich mixture to the lean mixture can be reduced. In other words, as shown in FIG. 5 showing the combustion characteristics of the rich-lean combustion apparatus, when the air ratio in the combustion is increased, in other words, when the ratio of the rich mixture to the lean mixture is reduced, the NOx generation value is reduced. . Also,
If the air ratio is extremely increased, the generation of CO, which is carbon monoxide, will increase.Therefore, by appropriately selecting the air ratio, the generation of NOx will be reduced without impairing the flame holding effect of the rich flame on the lean mixture. Meanwhile, generation of CO can be suppressed.

[Other Embodiments] (1) The second thick burner 3b described in the above embodiment may be configured as follows. A structure in which one or more rich flame ports 7 are provided between the both ends in the longitudinal direction of the flame port face for ejecting a rich air-fuel mixture on the flame port face 6 on the upper surface at both ends in the longitudinal direction of the flame port face. Is also good.

In other words, the second rich burner 3b has only to have a smaller number of rich flame ports 7 than the first rich burner 3a having a plurality of rich flame ports 7. . For example, as shown in FIG. 6, a configuration may be provided at both ends and substantially at the center in the longitudinal direction of the flame port surface. Further, the number of the second burner 3b is not limited to one, and a plurality of burners 3b having different numbers of the deep flame outlets 7 may be provided. For example, it is also possible to carry out a mixture of the third thick burner 3b provided with three thick burner ports 7 and the second thick burner 3b provided with two burners.

(2) In the above embodiment, the burner 3
a and 3b are alternately arranged side by side, but the second rich burner 3b between the first rich burner 3a is further reduced so as to reduce the ratio of the rich mixture to the lean mixture. May be configured to increase the number. For example, as shown in FIG. 7, two second thick burners 3 may be arranged in parallel between the first thick burners 3a, and three second thick burners 3b may be provided. It is good also as a structure which juxtaposes above.

(3) In the above embodiment, the burner 3
Although a and 3b are arranged alternately side by side, an arrangement as shown in FIG. 8 may be adopted so that the amount of combustion can be changed and adjusted. In other words, the first thick burners 3a are arranged at both ends of the blocks 1 and 2 in the direction in which the thick burners 3 are juxtaposed, and the amount of combustion can be changed without impairing the flame holding effect on the lean mixture. The arrangement may be such that it is adjustable. The combustion amount can be changed and adjusted in three stages, such as a case where only block 1 is burned, a case where only block 2 is burned, and a case where both blocks 1 and 2 are burned. May be adopted.

(4) Burner for dual use 3 described in the above embodiment.
In a and 3b, the deep flame outlet 7 may be configured as follows. As shown in FIG.
Is formed in a triangular chevron shape, the endmost flame of the slit-shaped flame holes forming each rich flame port 7 is formed at both longitudinal ends of the flame port surfaces of both burners 3a and 3b. The hole may be formed by a V-shaped flame hole 7b protruding in a direction away from the flame surface.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a concentration combustion device.

FIG. 2 is a longitudinal sectional front view of the concentration combustion device.

FIG. 3 is a perspective view of an enriching burner included in the concentration combustion device.

FIG. 4 is an arrangement diagram of an enrichment burner constituting the concentration combustion apparatus.

FIG. 5 is a combustion characteristic graph of the concentration combustion device.

FIG. 6 is an enrichment bar that constitutes a concentration combustion device of another embodiment.
Arrangement diagram

FIG. 7 is an enrichment bar that constitutes a concentration combustion device of another embodiment.
Arrangement diagram

FIG. 8 is an enrichment bar that constitutes a concentration combustion device of another embodiment.
Arrangement diagram

FIG. 9 is an enlarged view of both ends of an enriching burner that constitutes the concentration combustion device.

[Description of Signs] 3a First thick burner 3b Second thick burner 6 Flame face 7 Rich flame port 7a Slit-shaped flame hole 7b V-shaped flame hole 14 Light flame port

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Aitaka Tanimura 1-152 Oka, Minami-shi, Minato-ku, Osaka-shi, Osaka

Claims (6)

[Claims] 1. A plurality of rich burners having an elongated burner face at one end side and a rich burner port for burning and burning a rich mixture of fuel gas and combustion air on the burner face. Burners are arranged side by side at intervals in the width direction of the burner face, and a light mixture of fuel gas and combustion air is injected between the burner faces of the rich burner to burn. A rich burner provided with an elongated light flame port, wherein the rich burner is provided with a first rich burner provided with a plurality of rich flame ports in a longitudinal direction of the flame face. And a second burner having a smaller number of burner ports than the first burner in the longitudinal direction of the flame face. 2. The first thickening burner is disposed at both ends of the thickening burner in the juxtaposition direction, and between the first thickening burners disposed at both ends thereof. 2. The concentration combustion apparatus according to claim 1, wherein the second concentration burner is provided. 3. The first thickening burner and the second thickening burner.
3. The rich and light combustion device according to claim 1, wherein the burner includes the rich flame port near both ends in the longitudinal direction of the flame port surface. 4. 4. A rich flame opening of the first rich burner is provided at substantially equal intervals on the surface of the flame opening, and a rich flame opening of the first rich burner and a second rich burner are provided. 4. A light-to-dark combustion apparatus according to any one of claims 1 to 3, wherein the rich flame outlet of the burner is constituted by a plurality of slit-shaped flame holes. 5. A slit-shaped portion forming each of the rich flame ports at the rich flame ports located near both ends in the longitudinal direction of the flame surface of the first rich burner and the second rich burner. 5. The light and shade combustion apparatus according to claim 4, wherein, among the flame holes, the flame hole located at the end is formed as a V-shaped flame hole protruding in a direction away from the flame opening face. 6. A method according to claim 1, wherein one or more second thickening burners are arranged between the first thickening burners adjacent to each other in the direction in which the thickening burners are juxtaposed. 7. The concentration combustion device according to any one of items 1 to 5,